Patent GB-511323-A (GB)
Title: Machine for the automatic manufacture of glass bottles and the like
IPC: C03B9/22
Filed: 1938-06-29
Abstract: 511,323. Making hollow glassware. ROIRANT, E., and SOC. ANON. D'ETUDES ET DE CONSTRUCTIONS D'APPAREILS MECANIQUES POUR LA VERRERIE. June 29, 1938, No. 19241. [Class 56] A glassblowing machine of the continuously rotating single-table suction-gathering type is characterised by the fact that the parisons are blown to their final shape by atmospheric pressure and that commencement and duration of the blowing period may be varied as required. The mould units are carried by a drum 8, a plate 10, and an upper plate 11 which rotate continuously about a central column 12. In each mould unit, the parison mould 13 is arranged vertically above the finishing mould 14 which moves in a path below the tank 15 that contains the molten glass. The half of each parison mould is pivoted on a hollow shaft 17 carried by a slide 18 which is moved upwards and downwards by means of a stationary cam 20a on a cam drum 21 fixed to the column 12. The ring mould 22 slides on parallel vertical rods 24 and is moved up and down by a lever 25 oscillated by a cam 25b on the drum 21. Suction is applied to the ring mould and the parison mould through a flexible pipe 34 and a cavity in the slide 18, the application of suction being controlled by a cam-operated valve 32. The parison moulds are opened and closed by a cam 51, and the rods connecting the cam with the mould halves are provided with Cardan joints to yield to the vertical movements of the mould. An oscillating blade 40 shears the glass after a charge has been gathered. Moulds of different heights may be used simultaneously with each unit. The finishing mould 14 is opened and closed by a cam-operated slide 49a and closes on a bottom plate 59 which swings about a horizontal pivot 61. The blowing of the glass articles in the mould is effected by atmospheric pressure, as described in Specification 300 638, [Class 56], when suction is applied to the mould cavity. The ring mould is opened, when a parison is transferred to the finishing mould, by arms 66 which are oscillated by a cam and engage the halves of the ring mould and move them apart in the slide in which they are mounted. In operation, after a parison mould opens, the ring mould descends and deposits the parison in the finishing mould. The ring mould then opens and rises to its initial position and the parison is blown in the finishing mould by atmospheric pressure, the relative position of the moulds enabling blowing to be continued in the finishing mould while the parison mould is being charged.. The finished article is discharged from the mould by the tilting of the bottom 54. The application of suction to the mould cavity moulds and communicates with them by radial is controlled by a ring 89 which rotates with the pipes a. The ring rotates on a fixed disc 70 provided with a slot which forms a passage between the pipes a and the interior of the column 12 that serves as a vacuum reservoir. The disc 70 can be adjusted angularly about the column 12, and the adjustment, together with cocks in the pipes a, enables the time of application of the suction to the moulds as a whole, and to individual moulds, to be adjusted. The downward movement of the parison mould to gather glass can be prevented, when desired, by means of a horizontal slide 71 which is operated by an auxiliary cam 74 that is put into operation from the outside of the machine. The moulds and other parts of the machine are cooled by air which is blown through an opening 85 in the drum 8 on to the parison moulds, and on to the finishing moulds by tubes fitted to the drum. Air enters the drum from a stationary conduit 81, a conduit 82 in the machine, and openings 84 in the drum. A resilient joint connects the conduits 81, 82. The arrangement of the moulds &c. enables the machine to be of reduced diameter with one parison mould always dipped into the glass in the tank 15 during operation.